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    # PSGI
    if  (exists $self->env->{REQUEST_METHOD} || defined $self->env->{GATEWAY_INTERFACE} ||  exists $self->env->{HTTP_HOST}){
        return 0;
    }
    
    # CLI
    return 1;

    #if (-t STDIN) { }
    #use IO::Interactive qw(is_interactive interactive busy);if ( is_interactive() ) {print "Running interactively\n";}
}
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
=head2 error()
    
    $app->error("error message");

Fatal errors with custom error message. This is the same as C<croak> in L<CGI::Carp|CGI::Carp/croak>.

=cut